CLC-3565, add rspec-its cuz will be removed from rspec-3
CLC-3565, rspec v3: be_true > be_truthy, be_false > be_falsey
CLC-4364 - Update rails_admin

https://jira.ets.berkeley.edu/jira/browse/CLC-4364
Merge pull request #3057 from johncrossman/CLC-3565_rspec_upgrade

CLC-3565: gem rspec-its, be_true > be_truthy, be_false > be_falsey
Merge pull request #3061 from christianv/CLC-4364

CLC-4364 - Update rails_admin
CLC-4366 Move rails_admin into a Rails engine with its own Gemfile
CLC-4366 Remove some unused junk
Merge pull request #3062 from ctweney/ccadmin_experiment

CLC-4366 Move rails_admin into a Rails engine with its own gem space
CLC-4057 Reduce log noise from BackgroundJobsCheck
Also see what happens if we stop priming the message destinations with empty messages.
Merge pull request #3063 from raydavis/raywip

CLC-4057 Reduce log noise from BackgroundJobsCheck
CLC-3565, swap out deprecated stub! in controller test
Merge pull request #3064 from johncrossman/CLC-3565

CLC-3565, swap out deprecated stub! in controller test
CLC-4368 - Drop down icon on calendar sometimes overlaps

https://jira.ets.berkeley.edu/jira/browse/CLC-4368
Merge pull request #3065 from christianv/CLC-4368

CLC-4368 - Drop down icon on calendar sometimes overlaps